Heat-conducting tube



Feb. 11, 1930. T. E. MURRAY HEAT CONDUCTING TUBE Filed June 18,' 1924Patented Feb.l` 11, 1930- UNITED STATES PATENT! olv-Fica THOMAS E.MURRAY, F BRCOKLYN, NEW YORK; JOSEPH BRADLEY MURRAY, THOMAS E. MURRAY,JR., AND JOHN F. MURRAY DECEASED Application filed June 18,

In certain prior applications, Nos. 642,427 filed May 31, 1923 and642,725 filed June 1, 1923, I have described a certain hollowconstruction for walls and other parts of boilers or heaters and made upof tubes of rectangular, circular or irregular cross-section with finsor flanges extendin lengthwise thereof so as to provide a heatingsurface 'exposed` to the heating gases greater than the surface which isin contact with the water or other fluid in the tube.

The present invention provides a unit from which such boiler walls andthe like ma?7 be built. The accompanying drawings i lustrate embodimentsof the invention.

Fig. 1 is a horizontal section of a side wall of a boiler built Vwiththe. tubular units of the invention;

Fig. 2, is a plan of a unit made in accordance with the invention;

Figf is a perspective view of another unit;

Fig. same.

In another application pending concurrently herewith Serial No. 715.369,filed May 23, 1924, I have describeda certain style of unit for use inthe building. of such walls or screens. The resent application isdirected to units of di erent styles specifically from those describedin the said application and in other applications which I .have pending.

According to Fig. 1. the boiler wall is'provided with a lining or.screen comprising tubes 1 with fianges 2 which are of .zig-zag shape soas to provide an extended width of surface within a comparatively'shortspace between the tubes; the edges of the flanges from adjacent tubesbeing overlapped and hooked into engagement with each other so as tohold them close together in spite of distortion under heat. Back of thescreen thus formed is an ordinary wall which may, for example, be'madeof refractory bricks 3 and insulating tiles 4 held by a sheet steelcasinfr 5.

t:Ihe increased superficial area of the iins or fianges may besecured invarious other Ways than by bending. For example, in Fig.4

50 2 the fiange is formed of a common rolled 4 is a longitudinal sectionof' the diameter,

EXECUTORS 0F SAID THOMAS E. MURRAY,

HEAT-commune TUBE 1924. serial no. 790.734.

shape 6 which in turn is provided with fianges 7 on its side faces. Thusthe width of the surface exposed' is very' much greater than This theoverall width in a straightline. flange is fastened by butt welding asat 8 to a seamless steel tube. Various other methods maiy be used forassemblingthe parts.

nstead of getting the extended surface by use of a single flange memberas in Fi 2, it may be obtained 4by using a number o such membersseparately fastened to the tube. See Figs. Sand 4. Here the tube has anumber of rods 9 extending len hwise `and located at intervals around te outside of a portion of the tube. The same arrangement may be repeatedat the diametrically op osite portion o the tube. The rods 9 may e ofrectangular or other cross-section, instead of the round shape shown,and of* differing dimensions, and they may be united to the tube in`various ways. v

According to Fig.l 4, I have shown each of the rods 9 Welded atintervals in its length,

as at 10. to the outside of the seamless tube.

The intermediate parts of the rod may be in close contact with the tube,or maybe slighty ly separated therefrom as illustrated.

As described in Murray application No. 715,369, above referred to, thetubes may be of various shapes, and the flanges may be of variouscompositions or may be specially coated to increase their resistance tooxidation by the flame.

Though I have described with great par-l ticularity of detail certainembodiments of my invention, yet it is not to be understood vtherefromthat the invention is restricted to the `particular embodimentsdisclosed. Vari# ons modifications may be made by those skilled in theart without de arting from the invention as defined in t e followingclaims.

What I claim is:

1. A heat conducting unit for boilers constituting a separate andcomplete .article of manufacture and comprising a long,smallthin-walled, steel boiler tube adapted to carry water with alongitudinal iange extending the full length of the tube and adapted for'exposure to heating gases` Ion said flangehavin an exposed side facewhich is uneven and isf greater developed width than the projected widthof the ange itself so as to present an extended surface to the 5 heatinthe tube having a continuous wall o uniform thickness throughout itscircumference and the flange being a se arately formed piece welded atone edge to t e outer p face of the tube and .having `its otheredge l 2.The heat conducen unis of claim 1,

the ange being a strip o sheet metal of uniform thickness and zig-zagcross-section.

8. The combination of a plurality' of heat u conducting units forboilers separate from but adjacent to each other, each comprising atubular member adapted to car water and longitudinal fienges on oppositesides extending the full length of the unit and adapted zo for ex sureto the heating gases, said flanges ing vwelded to the tubular membersbut unconnected to each other, the flange of one unit having ahook-shaped portion engaging the ad'aeent edge of the flange of the 25next unit to o ld them together under distortion by heat. In witnesswhereof, I have hereunto signed;

my name.

THOMAS E. MURRAY. 30

